Posted on 8/28/2026
Transmission temperature is something most drivers rarely think about until a warning appears or a repair is needed. Yet every time an automatic transmission moves the vehicle away from a stop, changes gear ratios, or works under load, heat is being produced inside the unit. How manufacturers control that heat varies considerably from one vehicle to another. Looking through the grille and spotting a small heat exchanger doesn't necessarily tell the whole story. Some cooling components are hidden inside other assemblies, while certain vehicles use more than one method of controlling transmission temperature. How an Automatic Transmission Produces Heat Automatic transmissions contain clutches, bearings, gears, hydraulic circuits, and other components operating in transmission fluid. Conventional automatics also commonly use a torque converter, which transfers engine power through fluid and can produce considerable heat under certain operating conditions. Heat gen ... read more